Fig 1.
Typical examples of ultrasound shear wave elastographic images of the medial gastrocnemius at the passive and active (20% and 50% maximal voluntary contraction [MVC]) states, respectively.
The colored region represents the shear wave velocity map with the scale beside the images. The solid white line indicates the area selected as the region of interest.
Fig 2.
The experimental settings of sprint running measurement.
Fig 3.
Correlation coefficients between the sprint running velocity and the spatiotemporal variables at 50–60 m intervals of 100-m sprint running for 21 participants.
* Indicates a significant correlation (*p < 0.05, **p < 0.01).
Fig 4.
Relationship between shear wave velocity of the medial gastrocnemius at the passive/active (20% and 50% maximal voluntary contraction [MVC]) states and the 100-m sprint time.
The 100-m sprint time was corrected for wind.
Fig 5.
Relationship between shear wave velocity of the medial gastrocnemius at the passive/active (20% and 50% maximal voluntary contraction [MVC]) states and flight distance.
Table 1.
Relationships between the MG shear wave velocity and spatiotemporal variables.